I used to maintain one for a customer it didn't work by modem , the phone line went through it like a rj31x

as I recall it did a call waiting type thing if the phone was in use and someone was trying to call from the gate .

you could also open the gate with a star code from any phone in the house and use a star code to close it .

also allowed temp passwords you could say set a password for a party , then delete that password when the party was over .

I don't recall the name right off , I'm sure one of the alarm guys will chime in .

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Serving SW and West central Fl since 1984